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INVENTORY (Tables)
 12 Months Ended
Dec. 31, 2018
Inventories [Abstract]  
Disclosure of inventories
US$ MILLIONS
 
2018
 
2017
Current:
 
 
 
 
Natural gas inventory
 
$
94

 
$
84

Raw materials and other
 
47

 
24

Carrying amount of inventories
 
$
141

 
$
108